Thanks for a solution! I've tried to download on My Deal Downloads "Access and download Software installed on my PC from the Dell Factory" The only way to download is to use service tag method given. It tries to varified the service tag and it says service tag not supported. That is the reason I want to change service tag to match.
I can get the download for other drivers using what you suggested, it has a list of things to download and I've to make sure that is what my PC need.
Please advise how to use the flash method. I've read somewhere that you need to restart on some mode that I still don't know how to do it. May be you can help me?